attempt to move from mb3 to mb4...

[epugh]

Description

This attempts to get us to mb4 everywhere...

However, one test on user names fails since we move from case insensitive LIKE query to a case sensitive due to the collation.

Motivation and Context

This is an attempt to fix #1013 but I am nervous about the ramifications.

How Has This Been Tested?

Screenshots or GIFs (if appropriate):

Types of changes

• [] Bug fix (non-breaking change which fixes an issue)
• [] Improvement (non-breaking change which improves existing functionality)
• [] New feature (non-breaking change which adds new functionality)
• [] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [] My code follows the code style of this project.
• [] My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• [] I have read the CONTRIBUTING document.
• [] I have added tests to cover my changes.
• [] All new and existing tests passed.

[wrigleyDan]

@epugh It looks like changing the collation from utf8_bin to utf8mb4_unicode_cisolved the failing test from before.

Now a DB migration test fails caused by this test: db/migrate/20240512144038_fix_query_doc_pairs_document_fields_type.rb

One step in the right direction, and one step back...